Draft or air forcing device



(No Model.)

G, W. LORD. DRAFT 0R AIR FURGING DEVICE.

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UNITED STATES PATENT EEICE.

GEORGE NV. LORD, OF BOSTON, MASSACHUSETTS.

DRAFT OR AIR FORCING DEVICE.

SPECIFICATION forming part of Letters Patent No. 449,486, dated March31, 1891.

Application iilecl October 13.1890. Serial No. 367,944. (No model.)

To all whom t may concern:

Be it known that I, GEORGE W. LORD, a citizen of the United States, anda resident of Boston, in the county of Suffolk and State ofMassachusetts, have invented new and useful Improvements in Draft or AirForcing Devices, of which the following, taken in connection with theaccompanying drawings, is a specification.

This invention relates to improvements in draft or air forcing devicesparticularly designed for the purpose of producing an increased draft inboiler or other furnaces, &c.

The invention is also useful for the purpose of drying wool or othermaterials, as well as for Ventilating purposes Where it is desired tokeepup a circulation of fresh air in halls, rooms, or buildings of anykind.

In apparatus of this type, wherein the airconducting pipe is providedwith a flaring mouth and an adjustable funnel-shaped or conical cap, itis desirable that the latter be capable of even and accurate adjustmentand when adjusted that it be incapable of accidental movement in anydirection. To accomplish this by novel, simple, and economical devicesis the object of my invention; and to such end it consists in thefeatures of construction and the combination or arrangement of partshereinafter described and claimed, reference being made to theaccompanying drawings, in which- Figure l represents a centrallongitudinal section of a boiler-furnace and smoke-stack provided withmy improved draft or air forcing device. Fig. 2 represents a detail topplan of the head or injector, and Fig. 3 represents a centrallongitudinal section on the line X X shown in Fig. 2.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

In Fig. l, A represents a steam-boiler or heating apparatus of anysuitable form or construction, having iire-pot or furnace A', tubes A A,grate A3, and ash-pit A4, as usual.

B represents the smokestaek' or chimney, as usual, through which theheated products pass from the furnace of the boiler. Within such chimneyI locate an air-forcing pipe O,

through which air is forced by means of a rotary blower D, air-pu mp, orequivalent airforcing device. The upper end of the said pipe Oterminates ata suitable distance below the upper end of the smoke-stackB, and it is there provided with a head or injector of a novelconstruction, more particularly shown in detail in Figs. 2 and 3. Thesaid injector consists of a circular pipe E, the lower end of which issecured to the upper open end of the air-pipe C, and having its upperend provided With an outwardly-flaring annular lip or mouth E', as shownin Fig. 3.

Centrally Within the pipeE and rigidly connected therewith by radialarms is arranged a non-rotary or immovable spindle e, the upper end e ofwhich is screw-threaded, as shown in Fig. 3. On the spindle e islongitudinally adjustable the conical or inverted funnel-shaped cap F,adapted to be rotated on the immovable spindle, and the taper of whichis preferably made inclined toward the mouth E', that is less acuterelative to the spindle e than the inclined mouth E', as shown in Fig.8.

In practice I form with 'pr attach to the axially-rotating funnel or capF a nut f, adapted to receive the screw-threaded portion e of thespindle c, by which arrangement the position of said funnel can beadjusted relative to the flaring mouth E simply by turning it totheright or left, according to the size of the discharge-opening H desiredloetween the upper edge of the mouth E and the curved side of the funnelF. After the funnel has been adj usted, as above described, it is evenlysecured relative to the mouth E', so as to provide a uniform annulardischarge all around between the mouth E and cup F, and this is done bymeans of regulating-screws F F', screwed through the side of the cup Fand pressing against the iiaring mouth E', as shown in Figs. 2 and 3.After the cup F has been adjusted in position relative to the mouth E',as above described,y it is locked immovably in position by a check orthumb nut F2, which comes to rest against a part of the funnel-shaped orconical cap F. By this arrangement the size of the annulardischargeopening H can be regulated and adjusted with the greatestdegree of nicety, according to the IOO pressure and amount of airdesired to be forced out from the injector into the smokestack,Ventilating or air-circulating pipe.

It the device is to be used for drying purposes, hot air may be Vforcedout through the injector Without departing from the essence or lnyinvention. The air being forced out in an inclined annular directionagainst the interior of the smoke-stack or pipe B produces a partialvacuum in the latter below the injector, by which an induced current andupward draft is produced at a very slight expenditure of power. It isnot requisite that the pipe C should be arranged entirely Within thesmoke-stack B, as it may be arranged outside of the latter and connectedat its upper end to the injectorwithin the smoke-stack, as shown indotted lines in Fig. l.

IIavin g thus fully described the nature, construction, and operation ofmy invention, I Wish to secure by Letters Patent, and claim- In anair-draft apparatus, the combination, with air-forcing mechanism and anair-conducting pipe connected therewith and having a Haringdelivery-mouth, o f an immovable screw-spindle rigidly connected withthe airconducting pipe and rising through its flaring delivery-mouth, anaxially-rotating funnelshaped or conical cap having a screw-nut engaging the screW-spindle,wl1ereby the rotation ot the cap causes it to movevertically in the flaring mouth, a series of regulating-screws engagingthe cap and the Haring deliverymouth for evenly adjusting the formerrelatively to the latter, and a nut engaging the screw-spindle above andbearing against the top of the cap to lock the latter after adjustment,substantially as described.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing Witnesses, on this 9th day of October, A. D.1890.

GEORGE W. LORD.

Witnesses:

ALBAN ANDRN, ALICE A. PERKINS.

